أرسل هذا في رسالة قصيرة: The effects of surface and surface coatings on fluorescence properties of hollow NaYF4:Yb,Er upconversion nanoparticles

__    __   _    _     _____     ______    _  _   
\ \\ / // | || | ||  /  ___||  /_   _//  | \| || 
 \ \/ //  | || | || | // __     -| ||-   |  ' || 
  \  //   | \\_/ || | \\_\ ||   _| ||_   | .  || 
   \//     \____//   \____//   /_____//  |_|\_|| 
    `       `---`     `---`    `-----`   `-` -`